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Create a micro abstraction around the POSIX file APIs

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This way we can start to write IO code to read and write files in the
Git object database, but provide a hook to inject native Win32 APIs
instead so libgit2 can be ported to run natively on that platform.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2008-11-01 16:53:06 -07:00
parent 50298f44a4
commit 16a67770b7
8 changed files with 211 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitignore vendored
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@ -1,3 +1,4 @@
/apidocs
/include/git/config.h
*.o
*.a

10
Makefile
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@ -3,6 +3,7 @@ all::
DOXYGEN = doxygen
CFLAGS = -g -O2
OS = unix
BASIC_CFLAGS := -Iinclude
BASIC_CFLAGS += -DGIT__PRIVATE
@ -11,11 +12,16 @@ BASIC_CFLAGS += -fvisibility=hidden
OBJS = $(patsubst %.c,%.o,$(wildcard src/*.c))
HDRS = $(wildcard include/git/*.h)
OBJS += src/os/$(OS).o
HDRS += include/git/config.h
HDRS += include/git/os/$(OS).h
all:: libgit2.a
clean:
rm -f libgit2.a src/*.o
rm -f include/git/config.h
rm -rf apidocs
apidocs:
@ -25,6 +31,10 @@ apidocs:
.c.o:
$(CC) $(BASIC_CFLAGS) $(CFLAGS) -c $< -o $@
include/git/config.h: include/git/config.h.in
sed 's/@@OS@@/$(OS)/g' $< >$@+
mv $@+ $@
$(OBJS): $(HDRS)
libgit2.a: $(OBJS)
rm -f libgit2.a

1
include/git/commit.h
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@ -28,7 +28,6 @@
#include "git/common.h"
#include "git/oid.h"
#include <time.h>
/**
* @file git/commit.h

19
include/git/common.h
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@ -36,6 +36,13 @@
# define GIT_END_DECL /* empty */
#endif
/** Declare a public function exported for application use. */
#ifdef __GNUC__
# define GIT_EXTERN(type) __attribute__((visibility("default"))) type
#else
# define GIT_EXTERN(type) type
#endif
/**
* @file git/common.h
* @brief Git common platform definitions
@ -43,14 +50,6 @@
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/** Declare a public function exported for application use. */
#ifdef __GNUC__
# define GIT_EXTERN(type) __attribute__((visibility("default"))) type
#else
# define GIT_EXTERN(type) type
#endif
/** Operation completed successfully. */
#define GIT_SUCCESS 0
@ -69,6 +68,10 @@ GIT_BEGIN_DECL
/** Input does not exist in the scope searched. */
#define GIT_ENOTFOUND (GIT_ERROR - 2)
#include "git/config.h"
GIT_BEGIN_DECL
/** A revision traversal pool. */
typedef struct git_revp git_revp;

31
include/git/config.h.in Normal file
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@ -0,0 +1,31 @@
/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDE_git_config_h__
#define INCLUDE_git_config_h__
#include "git/os/@@OS@@.h"
#endif

1
include/git/odb.h
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@ -28,7 +28,6 @@
#include "git/common.h"
#include "git/oid.h"
#include <unistd.h>
/**
* @file git/odb.h

111
include/git/os/unix.h Normal file
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@ -0,0 +1,111 @@
/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDE_git_os_abstraction_h__
#define INCLUDE_git_os_abstraction_h__
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <time.h>
/**
* @file git/os/unix.h
* @brief Portable operating system abstractions
* @defgroup git_os_abstraction Portable operating system abstractions
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/** Descriptor to an open file in the filesystem. */
typedef int git_file;
/**
* Open a file by path name.
*
* Valid flags are:
* - O_CREAT: Create the file if it does not yet exist.
* - O_RDONLY: Open the file for reading.
* - O_WRONLY: Open the file for writing.
* - O_RDWR: Open the file for both reading and writing.
*
* @param path path name of the file to open.
* @param flags bitmask of access requested to the file.
* @return the opened file descriptor; <0 if the open failed.
*/
static inline git_file git_fopen(const char *path, int flags)
{
return open(path, flags);
}
/**
* Close an open file descriptor.
* @param fd descriptor to close.
* @return 0 on success; <0 if the descriptor close failed.
*/
static inline int git_fclose(git_file fd)
{
return close(fd);
}
/**
* Read from an open file descriptor at the current position.
*
* Less than the number of requested bytes may be read. The
* read is automatically restarted if it fails due to a signal
* being delivered to the calling thread.
*
* @param fd open descriptor.
* @param buf buffer to store the read data into.
* @param cnt number of bytes to transfer.
* @return
* - On success, actual number of bytes read.
* - On EOF, 0.
* - On failure, <0.
*/
GIT_EXTERN(ssize_t) git_fread(git_file fd, void *buf, size_t cnt);
/**
* Write to an open file descriptor at the current position.
*
* Less than the number of requested bytes may be written. The
* write is automatically restarted if it fails due to a signal
* being delivered to the calling thread.
*
* @param fd open descriptor.
* @param buf buffer to write data from.
* @param cnt number of bytes to transfer.
* @return
* - On success, actual number of bytes written.
* - On EOF, 0.
* - On failure, <0.
*/
GIT_EXTERN(ssize_t) git_fwrite(git_file fd, void *buf, size_t cnt);
/** @} */
GIT_END_DECL
#endif

47
src/os/unix.c Normal file
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@ -0,0 +1,47 @@
/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <errno.h>
#include "git/common.h"
ssize_t git_fread(git_file fd, void *buf, size_t cnt)
{
for (;;) {
ssize_t r = read(fd, buf, cnt);
if (r < 0 && (errno == EINTR || errno == EAGAIN))
continue;
return r;
}
}
ssize_t git_fwrite(git_file fd, void *buf, size_t cnt)
{
for (;;) {
ssize_t r = write(fd, buf, cnt);
if (r < 0 && (errno == EINTR || errno == EAGAIN))
continue;
return r;
}
}